jmonter2010
Member
Hello Everyone,
I currently have a job with a customer that wants to operate an injection pump for Sodium Hypochlorite injection using a PID as follow.
"The control should depend on the finished water storage tank free chlorine concetration and the permeate flow rate. A setpoint for free chlorine concentration in the finished water storage tank should be made adjustable for the opetators, a PID control shall be used to adjust the pump speed so that the desired chlorine concentration is maintained"
From the controls description I'm thinking a cascade PID, but from what I been reading a PID is usually does not work because of the locations of the injection and the location of the analyzer.
I have not done a chemical dosing system does anyone have any samples logic or point me to the right direction.
[RO] --> [FLOW Transmitter] --> [Injection Pump] --> [Finished Storage Tank and CL2 Analyzer]
Thanks for the Help.
I currently have a job with a customer that wants to operate an injection pump for Sodium Hypochlorite injection using a PID as follow.
"The control should depend on the finished water storage tank free chlorine concetration and the permeate flow rate. A setpoint for free chlorine concentration in the finished water storage tank should be made adjustable for the opetators, a PID control shall be used to adjust the pump speed so that the desired chlorine concentration is maintained"
From the controls description I'm thinking a cascade PID, but from what I been reading a PID is usually does not work because of the locations of the injection and the location of the analyzer.
I have not done a chemical dosing system does anyone have any samples logic or point me to the right direction.
[RO] --> [FLOW Transmitter] --> [Injection Pump] --> [Finished Storage Tank and CL2 Analyzer]
Thanks for the Help.